Holyoke Hydrant and Iron Works were the makers of the Holyoke Fire Hydrant. They were located at 42 Commercial Street at the corner of Hampshire. They existed from 1887 to 1896.
Their previous company was the Pattee Co. and they existed from 1870. They were at 28 Main Street. See note. See also their mill on Main St.
They would become the Norwood Co in Northampton.
Read about the company at LINK
Sanborn map analysis:
Sanborn 1884 map – they are on Main Street as Pattee
Sanborn 1915 map – Holyoke Water Works takes over this location